Dear Mr. Smith: I've been invited to a summer function in Ottawa, and the dress code is " tenue de ville ." How formalis that? Will a stylish summer sports jacket do? Tenue de ville means slightly ...

"SOS" may be the lyrics to your favorite ABBA song, but it has important historical significance. Here's what it means and why it's not what you think ...

What does gain of function mean? Any organism can acquire a new ability or property, or "gain" a "function." This can happen through natural selection or a researcher's experiments.